Oral brush



FIG. 1 is a front view of an embodiment of an oral brush;

FIG. 2 is a first side view of the embodiment of the oral brush;

FIG. 3 is a back view of the embodiment of the oral brush;

FIG. 4 is a second side view of the embodiment of the oral brush;

FIG. 5 is an end view taken from the left side shown in FIG. 3 of the embodiment of the oral brush; and,

FIG. 6 is an end view taken from the right side shown in FIG. 3 of the embodiment of the oral brush. 

CLAIM The ornamental design for an oral brush, as shown and described. 